Prepartion Of Magnesium Hydroxide Flame Retardant From Magnesinum-Oxide By Rotor-Stator Reactor

The flame retardant magnesium hydroxide powder was prepared by two-step method using magnesium oxide which was calcined by magnesium chloride as raw material. Two-Step method consists of hydrating and hydrothermal reaction process. The effects of hydration time, hydrothermal reaction time and temperature, and the concentration of sodium hydroxide on the morphology and structure of magnesium hydroxide had been studied. Special attention was given to the obtaining of platelet-shaped, high purity and de-agglomerated powders.The characterization of magnesium hydroxide powder was investigated by X-ray diffraction (XRD), scanning electronic microscope (SEM), and nitrogen absorption BET analyzer.It is indicated that magnesium oxide has been completely hydrated after3h. As the hydrothermal temperature and time increased, crystal size became larger and crystalline dispersion became remarkable. Additionally, increasing the hydrothermal additives concentration of sodium hydroxide can significantly improve the degree of crystallization crystals, reduce the microscopic internal strain of crystal, and enhance powder dispersibility.Comparing to ordinary agitation reactor, the thickness of magnesium hydroxide crystal could achieve100-200nm by using rotor-stator reactor and hydrothermal modification to produce magnesium hydroxide. The first partical size is above1μm. The micro-strain of (101) crystal face is much lower.Rotor-stator reactor preparation of ultrafine magnesium hydroxide flame retardants in optimum conditions,3h of hydration reaction time,2800r/min of the speed of rotor-stator reactor,32per hour times circulation volume ratio.After a common silane modified, flame retardant produced by rotor-stator reactor reached a considerable preparation and German Martin MAGNIFIN H5-type magnesium hydroxide product level...